A man San Francisco police accused of attacking another man and using anti-gay slurs in the Mission district over the weekend was set to be arraigned Tuesday (December 24).

Police arrested Jason Williams, 38, in the alleged attack, which started around 11:45 p.m. Friday, December 20 when the victim walked past Williams in the 500 block of Valencia Street, according to Sergeant Eric O’Neal, a spokesman for the San Francisco Police Department.

Williams “began insulting [the victim] with epithets,” and punched him in the face, causing him to fall and hit his head on the sidewalk, O’Neal said in a summary. The victim, 43, lost consciousness and suffered a non-life threatening head injury,

In an interview, O’Neal said that Williams “said some homophobic obscenities” to the victim, but he didn’t have details of what exactly Williams allegedly said.

“It’s an open investigation right now,” said O’Neal.

Officers arrived and arrested Williams on charges of battery causing serious bodily injury, inflicting great bodily injury while committing a felony, and committing a hate crime.

According to a staffer at the public defender’s office, prosecutors are keeping the battery charge but dismissing the other two charges. Williams was due to be formally charged Tuesday afternoon.

Stephanie Ong Stillman, a spokeswoman for the district attorney’s office, wasn’t immediately available for comment.

Williams is in San Francisco County jail on $165,000 bail. It wasn’t clear early Tuesday who would represent him.

There has been heightened concern in the Mission in recent months around attacks on transgender women. O’Neal didn’t know whether the victim is gay or transgender. He said Williams is “transient” but has been living in San Francisco.

O’Neal said he also didn’t have details on any prior relationship between Williams and the victim, and he wasn’t able to provide a booking photo of Williams.